The error message I receive in <oXygen/> XML Developer 18.0 is: The reference to entity "action" must end with the ';' delimiter.

I’ve used several combinations, tried to escape the ampersand (%26, &#38; and &amp;), but I don’t get the result I need: a valid link to the reference when clicking it on the Error Result viewport pane in <oXygen/> XML Editor 18.0.

I tested and reproduced the issue on our side. Using &amp; is the proper way to escape the & in the Schematron but Oxygen should have unescaped the @see attribute value when presenting it as a more details destination on the error.I added an internal issue for this, we'll try to fix it in Oxygen 19 (April-May this year).

About every couple of weeks we also release Oxygen 18.1 minor bug fix releases, I managed to schedule the fix for the next Oxygen 18.1 minor bug fix release, so you might have the fix sooner. We'll update this forum thread when the fix is available.

I downloaded Oxygen 18.1 (build 2017020917) and tested, but it is not working for me. The escaped ampersand in the @see attribute doesn't turn to the unescaped ampersand ("&") in the "more details destination" on the error pane.

Sorry, my mistake. The problem is fixed in Oxygen 19.0.We had plans to fix it for Oxygen 18.1, we fixed in our internal branch but as we did not create new Oxygen 18.1 kits containing the fix, the fix is not contained in the Oxygen 18.1 kits we have on our web site.